2.1 Discrete-time LTI Systems : The Convolution Sum （卷积和） 2.1.1 The Representation of Discrete-Time Signals in Terms of impulses

Let be a band-limited signal with then is uniquely determined by its samples if where

9.1 The Laplace Transform 1. The relationship 2. Region of Convergence（收敛域）

6.1 The Magnitude-Phase Representation （ 幅度-相位） of the Fourier Transform

4.1 Representation of Aperiodic Signals :The Continuous-Time Fourier Transform

1. Continuous-time system 2. Discrete-time system

1. is absolutely summable, 2. has finite energy

9.1 结构体 9.2 共用体 9.3 枚举类型与类型命名

一、while循环控制 二、do-while循环控制 三、for循环控制 四、 用goto语句实现循环控制 五、循环结构中的跳转语句 六、循环的嵌套 七、循环结构程序设计举例

10.1 文件的概念 10.2 文本文件的读写 10.3 二进制文件的读写